Furnace construction



D. R. INGRAM.

FURNACE CONSTRUCTION.

APPLICATION man APR. 14. 1919.

1,326,060. Pam-,ed Dec. 23,1919.

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FURNACE CONSTRUCTION.

APPucATloN man APR. 14. |919.

Patented Deo. 23, 1919.

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` the purpose ofproviding a 'ledge or shoulderV DAVID R. INGLrYRAM, OFELKINS, WEST VIRGINIA.

FUENACE QONSTRUCTION.

Specification of Letters Patent.

PatentedDec. 23, 1919.

Application led April 14, 1919. Serial No. 289,882.

vTo* all fr0/"wm t may concern:

Be it known that I, DAVID R. INGRjAM, a citizen Vof `the United States,residino` at Elkins, in the county of Randolph and tate of WestVirginia, have kinvented new and useful Improvements in FurnaceConstruction, of which the following is a specification.

rlhis invention relates to furnace construe tion, the object'being toprovide a furnace in .whichV the products of combustion are entirelyconsumed, whereby a maximum of heat units is obtainedfrom a given amountof fuel.

Another object ofthe invention is the provision of a boiler in whichcold air enter` ing the combustion chamber, when firing, will bevprevented from reaching the boller, saidy air traveling through heatcollecting chambers where it is properly heated before reaching theflues.

Other objects and advantages of the invention will appear as thefollowing description is read in connection with the accompanyingdrawings.

Y In the drawings:

Figure 1 is a central longitudinal sectional view through a furnaceconstructed in accordance with the present invention.

Fig. 2 is a sectional view on the line 2-2 Y of Fig. 1. Y* Y Fig. 3 is asimilar viewon the line 3 3 of Fig.

rig. i is a like View (mais une 4 4. (if Fig. 1.`

Referring to the drawings in detail, like characters of reference denotecorresponding parts throughout the several views.

The furnace, which comprises the present invention, is formed of theusual walls 10, which in the present instance support a Yboiler 11,shown as of thereturn flue type.

lThe front wall 12 of the furnace is provided with the usual openings,vwhich includes a feed opening 13, a clean out opening 14 and an ash pitopening 15,V all of which areprovided with suitable doors. l

The combustion chamber is shown at 16 and is formed of a substantiallycircular vertically disposed wall 17, whose lower end is increased inthickness, as shown at 18, for

19. rlfhis ledge or shoulder supports a grate 20, which is positionedover the ash pit 21.

The wall 17 of the combustion chamber is of an appreciable height and issurrounded by a. substantially circular wall 22, which is Y spaced fromthe wall `17 to provide an additional combustion chamber 23. The wall 22provides alca'sing, the top of which is preferably dome shapedandsemi-spherical, as indicated at 24, so that the products of com-'bustion rising from the chamber 16 will be deflected downwardly intothe combustion or heat collecting chamber 28, provided between the walls17 and 22. As the wall 17 is brought to an intense heat bythe fire inthe chamber 16, the gases and smoke passing from this chamber will bedirected downwardly into the chamber 23, where they will be maintainedat ignition temperatures by the heat from the wall 17 and furtherconsumed.

Located near the bottom of the wall 22, are outlets 25, through whichthe products of combustion pass and enter another combustion chamber 26formed by the wall 22 and by a baffle wall 27 extending transverselyacross the furnace. The passage of the products of combustion isretarded by the wall 27 and they are again ignited by vthe intense heatthrown off from the wall 22, so that all of the gases and smoke passingfrom the comb-ustion chamber are entirely consumed before leaving thechamber 26, the heat therefrom rising for contact with the boiler 11.The usual draft ue 28 is provided to insure proper combustion.

From the foregoing it will be seen that the products of combustionleaving the chamber 16 are consumed in their passage through the chamber23 and are retarded by the wall 27, which provides a further combustionchamber, as before explained. In addition, cold air is prevented fromreaching the boiler when the door 13 of the furnace is open for thepurpose of heating, thus overcoming a. well known objectionable feature.This is effected by causing the cold air, which enters the chamber 16,to pass 1 through the heat collected in the chambers herein reserved tomake Such changes as properly fall Within the scope of the appendedclaim. Having described the invention, what is claimed is:

A furnace including an outer casing, a

circular combustion chamber therein, saidv chamber beingopen at the top,a Wall surrounding the combustion chamber and spaced therefrom, saidWall conforming in horizontal outline to the outline of the combustionchamber, a semi-spherical dome upon said Wall, said dome being spacedabove the Walls or' the combustion chamber to provide communicationbetween said chamber and the space surrounding the same and to directthe products of combustion downward into said space, the surroundingWall having openings located in the bottom in opposite sides thereof anda batlie Wall connecting the side Walls or the outer casing to provide acasingl surrounding the last mentioned Wall, said baille Wallterminating Short of the top of the outer casino: Y

ln testimony whereof l atix my signature.

DAVID R. lNGRAM.

